Abstract
The 2016 World Health Organization Classification of Tumors of the Central Nervous System incorporates the use of molecular information into the classification of brain tumors, including grade II and III gliomas, providing new prognostic information that cannot be delineated based on histopathology alone. We hypothesized that these genomic subgroups may also have distinct imaging features. A retrospective single institution study was performed on 40 patients with pathologically proven infiltrating WHO grade II/III gliomas with a pre-treatment MRI and molecular data on IDH, chromosomes 1p/19q and ATRX status. Two blinded Neuroradiologists qualitatively assessed MR features. The relationship between each parameter and molecular subgroup (IDH-wildtype; IDH-mutant-1p/19q codeleted-ATRX intact; IDH-mutant-1p/19q intact-ATRX loss) was evaluated with Fisher’s exact test. Progression free survival (PFS) was also analyzed. A border that could not be defined on FLAIR was most characteristic of IDH-wildtype tumors, whereas IDH-mutant tumors demonstrated either well-defined or slightly ill-defined borders (p = 0.019). Degree of contrast enhancement and presence of restricted diffusion did not distinguish molecular subgroups. Frontal lobe predominance was associated with IDH-mutant tumors (p = 0.006). The IDH-wildtype subgroup had significantly shorter PFS than the IDH-mutant groups (p < 0.001). No differences in PFS were present when separating by tumor grade. FLAIR border patterns and tumor location were associated with distinct molecular subgroups of grade II/III gliomas. These imaging features may provide fundamental prognostic and predictive information at time of initial diagnostic imaging.
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13 September 2017
In the initial online publication, the values in the last two rows in Table 1 were in the wrong rows. The original article has been corrected.
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Acknowledgements
We would like to thank patients at the UCSD Moores Cancer Center Neuro-Oncology Program for their generous participation.
Funding
National Institutes of Health Grants R01NS065838 (C.R.M.), RC2 DA29475 and EB00790-06 (A.M.D.), UL1TR000100 and KL2TR00099 (J.A.H.); National Cancer Institute Cancer Center Specialized Grant P30CA023100 (C.R.M.); National Science Foundation Grant 1430082 (N.S.W.); American Cancer Society Award ACS-IRG 70-002 (J.A.H.); and American Cancer Society Research Scholar Grant RSG-15-229-01-CCE (C.R.M.).
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The original version of this article has been revised: The values in the last two rows in Table 1 have been switched to the correct rows.
An erratum to this article is available at https://doi.org/10.1007/s11060-017-2620-8.
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Delfanti, R.L., Piccioni, D.E., Handwerker, J. et al. Imaging correlates for the 2016 update on WHO classification of grade II/III gliomas: implications for IDH, 1p/19q and ATRX status. J Neurooncol 135, 601–609 (2017). https://doi.org/10.1007/s11060-017-2613-7
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DOI: https://doi.org/10.1007/s11060-017-2613-7